nuckollsr(at)cox.net
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 Posted: Fri Feb 02, 2007 11:57 am Post subject: Sharing ship's COMM antenna with the hand-held (additional |
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I've been getting some direct e-mails that suggest a need
for further explanation.
Take a peek at this photo . . .
http://www.aeroelectric.com/Pictures/Connectors/3p5_mm_Jack.jpg
I've pointed to the little hunk of exposed brass that is supposed
to maintain connection between the antenna and the panel mounted
comm when the hand held is unplugged.
This contact is exposed to the environment and not plated
for longevity. Further, the wire connection terminals are
relatively flimsy . . . if you recall - the Shop Notes
I published recommended splicing short, flexible pigtails
to the stub ends of coax center conductors so as to isolate
the switch terminals from potential forcing by the stiffer
coax.
Alternatives? Maybe. See . . .
http://www.aeroelectric.com/Pictures/Connectors/3p5_mm_Jack_2.jpg
These are ECB mounted, closed circuit jacks. No stresses
will be input to the switch structure due to coax . . .
See also . . .
http://www.aeroelectric.com/Pictures/Connectors/3p5_mm_jack_schematic.pdf
Specs for these switches speak to silver plating of some parts.
I need to explore this further. What I'm considering is a small
ECB assembly that mounts one of these jacks and two right angle
BNC jacks to take antenna and transceiver coaxes off the board
and into ships wiring.
I think this could be a quantum jump up from the Shop Notes design
and perhaps more robust and compact than the ICOM product. We'll
see . . .
Bob . . .
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( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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